#include<iostream>
using namespace std;
int main()
{
	int n;cin>>n;
	int col=0;
	while(n!=1)
	{
		if(n%2==0)
		{
			n/=2;
			col++;
		}else
		{
			n=(3*n+1)/2;
			col++;
		 } 
	}
	cout<<col<<endl;
	return 0;
}
